JP6864437B2 - Rolling bearing - Google Patents

Rolling bearing Download PDF

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JP6864437B2
JP6864437B2 JP2016061482A JP2016061482A JP6864437B2 JP 6864437 B2 JP6864437 B2 JP 6864437B2 JP 2016061482 A JP2016061482 A JP 2016061482A JP 2016061482 A JP2016061482 A JP 2016061482A JP 6864437 B2 JP6864437 B2 JP 6864437B2
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resin
cage
coating film
ball
rolling
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JP2017172749A (en
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晋一 吉岡
晋一 吉岡
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NTN Corp
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NTN Corp
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Priority to JP2016061482A priority Critical patent/JP6864437B2/en
Priority to PCT/JP2017/012136 priority patent/WO2017164399A1/en
Priority to US16/088,299 priority patent/US20190093706A1/en
Priority to EP17770439.2A priority patent/EP3434919B1/en
Priority to CN201780018975.9A priority patent/CN108884870A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/3837—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages
    • F16C33/3862—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages comprising two annular parts joined together
    • F16C33/3868—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages comprising two annular parts joined together made from metal, e.g. two cast parts joined by rivets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/3837—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages
    • F16C33/3843—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages
    • F16C33/385—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages made from metal, e.g. cast or machined window cages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/42—Ball cages made from wire or sheet metal strips
    • F16C33/422—Ball cages made from wire or sheet metal strips made from sheet metal
    • F16C33/427—Ball cages made from wire or sheet metal strips made from sheet metal from two parts, e.g. ribbon cages with two corrugated annular parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/44—Selection of substances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/44—Selection of substances
    • F16C33/445—Coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6696—Special parts or details in view of lubrication with solids as lubricant, e.g. dry coatings, powder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/10—Railway vehicles

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Description

本発明は、転がり軸受（特に玉軸受）用の保持器と、これを用いた転がり軸受に関し、特に鉄道車両の主電動機用主軸の支持に用いられる転がり軸受に関する。 The present invention relates to a cage for rolling bearings (particularly ball bearings) and rolling bearings using the same, and particularly to rolling bearings used to support spindles for traction motors of railway vehicles.

鉄道車両の主電動機用の軸受は、温度変化に起因した主軸の軸方向への膨張および収縮に対応するため、固定側の軸受として転がり玉軸受が用いられ、自由側の軸受としては主軸の膨張および収縮に対応可能な円筒ころ軸受が用いられる場合が多い。固定側の転がり玉軸受は、例えば深溝玉軸受であり、鋼球と鉄板波型保持器とを備えている。また、固定側と自由側の両方に転がり玉軸受を用いた支持構造も提案されている。自由側も玉軸受とすることで、円筒ころ軸受を用いる場合と比較して転がり抵抗が小さくなり、エネルギー効率が向上し、軸受の昇温も抑制できる。このため、主電動機の動作時におけるエネルギー損失を低減でき、またグリース寿命を延長できる。 For the bearings for the main motors of railway vehicles, rolling ball bearings are used as the bearings on the fixed side and the expansion of the spindles as the bearings on the free side in order to cope with the expansion and contraction of the spindle in the axial direction due to temperature changes. In many cases, cylindrical roller bearings that can handle shrinkage are used. The rolling ball bearing on the fixed side is, for example, a deep groove ball bearing, and includes a steel ball and an iron plate corrugated cage. In addition, a support structure using rolling ball bearings on both the fixed side and the free side has also been proposed. By using ball bearings on the free side as well, rolling resistance is reduced, energy efficiency is improved, and the temperature rise of the bearing can be suppressed as compared with the case where a cylindrical roller bearing is used. Therefore, the energy loss during operation of the traction motor can be reduced, and the grease life can be extended.

従来、このような玉軸受の金属製保持器としては、一対の波形環状体を組み合わせてなる鉄板波形保持器を用いていた。この鉄板波形保持器の表面には、金属板の表面に下地被膜を形成した後、その上に三価クロムのクロメート（クロム酸塩）の薄い被膜を形成していた。例えば、この種の転がり軸受用保持器として、特許文献１では、冷延鋼表面に、電気亜鉛メッキ、電気錫−亜鉛合金メッキ、電気亜鉛−鉄合金メッキ、電気亜鉛−ニッケル合金メッキなどの防錆下地処理を行なった後、その上に所定の三価クロメート処理を行なったものが提案されている（特許文献１参照）。 Conventionally, as a metal cage for such ball bearings, an iron plate corrugated cage formed by combining a pair of corrugated annular bodies has been used. On the surface of this iron plate corrugated cage, a base film was formed on the surface of a metal plate, and then a thin film of trivalent chromium chromate (chromate) was formed on the base film. For example, as a cage for this type of rolling bearing, in Patent Document 1, the surface of cold-rolled steel is protected from electric zinc plating, electric tin-zinc alloy plating, electric zinc-iron alloy plating, electric zinc-nickel alloy plating, and the like. It has been proposed that a rust base treatment is performed and then a predetermined trivalent chromate treatment is performed on the rust base treatment (see Patent Document 1).

特開２００７−２４２９５号公報Japanese Unexamined Patent Publication No. 2007-24295

しかしながら、軸受用保持器は、潤滑状態が悪くなると、転動体である玉の進み遅れにより、該玉と接触するポケット内の周方向案内面に摩耗が生じるおそれがある。この保持器の金属摩耗粉がグリースに混入すると、更に潤滑状態が悪化し、グリースの潤滑寿命が低下する。従来のメッキ処理とクロメート処理の保持器を用いる場合、耐食性の向上が図れるが、使用条件によっては、このような摩耗とグリース潤滑寿命の低下が発生するおそれがある。特に、鉄道車両の主電動機用の軸受では、近年における高速化かつメンテナンス周期延伸のため、上記のような問題のより確実な防止が望まれている。 However, when the lubrication state of the bearing cage is deteriorated, the circumferential guide surface in the pocket in contact with the ball may be worn due to the advance delay of the ball which is the rolling element. If the metal wear powder of this cage is mixed with the grease, the lubrication state is further deteriorated and the lubrication life of the grease is shortened. When a conventional plating and chromate treatment cage is used, corrosion resistance can be improved, but such wear and a decrease in grease lubrication life may occur depending on the usage conditions. In particular, in bearings for traction motors of railway vehicles, more reliable prevention of the above problems is desired in order to increase the speed and extend the maintenance cycle in recent years.

本発明はこのような問題に対処するためになされたものであり、金属製保持器を用い、グリースによる潤滑機能が低下した場合でも、転動体である玉を保持するポケットの案内面での摩耗を抑制できる転がり軸受用保持器、および、この保持器を用いた転がり軸受の提供を目的とする。 The present invention has been made to deal with such a problem, and even if a metal cage is used and the lubrication function due to grease is deteriorated, wear on the guide surface of a pocket holding a ball which is a rolling element is worn. It is an object of the present invention to provide a cage for rolling bearings capable of suppressing the above-mentioned pressure, and a rolling bearing using this cage.

本発明の転がり軸受用保持器は、転がり軸受の転動体を保持する転がり軸受用保持器であって、上記保持器は、上記転動体である玉を保持するポケットを円周方向の複数箇所に有する金属製の保持器であり、少なくとも転動体案内面となる上記ポケットの内面に樹脂塗膜を有し、該樹脂塗膜は、芳香族ポリエーテルケトン系樹脂をマトリックス樹脂とし、固体潤滑剤を含む樹脂組成物の塗膜であることを特徴とする。 The cage for rolling bearings of the present invention is a cage for rolling bearings that holds a rolling element of a rolling bearing, and the cage has a plurality of pockets in the circumferential direction for holding a ball that is the rolling element. It is a cage made of metal and has a resin coating film on the inner surface of the pocket which is at least a rolling element guide surface. The resin coating film uses an aromatic polyetherketone resin as a matrix resin and a solid lubricant. It is a coating film of a resin composition containing the mixture.

上記樹脂塗膜は、ポリエーテルエーテルケトン樹脂をマトリックス樹脂とし、固体潤滑剤としてポリテトラフルオロエチレン樹脂を含む樹脂組成物の塗膜であることを特徴とする。また、上記樹脂塗膜の膜厚が２０μｍ〜５０μｍであることを特徴とする。 The resin coating film is characterized by being a coating film of a resin composition containing a polyetheretherketone resin as a matrix resin and a polytetrafluoroethylene resin as a solid lubricant. Further, the film thickness of the resin coating film is 20 μm to 50 μm.

上記保持器は、一対の環状体が上記ポケット間に位置する連結部で結合された波形保持器であり、これら環状体の全面に上記樹脂塗膜を有することを特徴とする。 The cage is a corrugated cage in which a pair of annular bodies are connected by a connecting portion located between the pockets, and is characterized by having the resin coating film on the entire surface of these annular bodies.

本発明の転がり軸受は、内輪および外輪と、この内輪と外輪との間に介在する転動体である玉と、この玉を保持する保持器とを備えてなり、この保持器が本発明の転がり軸受用保持器であることを特徴とする。また、この転がり軸受は、鉄道車両の主電動機の主軸を回転自在に支持する軸受であり、グリース潤滑で使用されることを特徴とする。 The rolling bearing of the present invention comprises an inner ring and an outer ring, a ball which is a rolling element interposed between the inner ring and the outer ring, and a cage for holding the ball, and this cage is the rolling of the present invention. It is a cage for bearings. Further, this rolling bearing is a bearing that rotatably supports the spindle of a traction motor of a railroad vehicle, and is characterized in that it is used for grease lubrication.

本発明の転がり軸受用保持器は、転動体である玉を保持するポケットを円周方向の複数箇所に有する金属製の保持器であり、少なくとも転動体案内面となるポケットの内面に樹脂塗膜を有し、該樹脂塗膜は、芳香族ポリエーテルケトン系樹脂をマトリックス樹脂とし、固体潤滑剤を含む樹脂組成物の塗膜であるので、グリースによる潤滑機能が低下した場合でも案内面での摩耗を抑制できる。より詳細には、転動体である玉の進み遅れにより、該玉と接触する周方向案内面での摩耗を抑制できる。この結果、保持器からの金属摩耗粉の発生を防止でき、該摩耗粉がグリースに混入して潤滑寿命が低下するなどの問題を解消できる。 The cage for rolling bearings of the present invention is a metal cage having pockets for holding balls, which are rolling elements, at a plurality of locations in the circumferential direction, and at least the inner surface of the pockets serving as a guide surface for the rolling element is coated with a resin. Since the resin coating film is a coating film of a resin composition containing an aromatic polyetherketone-based resin as a matrix resin and a solid lubricant, even if the lubrication function by grease is deteriorated, the guide surface can be used. Wear can be suppressed. More specifically, due to the advance / delay of the ball, which is a rolling element, wear on the circumferential guide surface in contact with the ball can be suppressed. As a result, it is possible to prevent the generation of metal wear debris from the cage, and it is possible to solve problems such as the wear debris being mixed with the grease and shortening the lubrication life.

特に、樹脂塗膜が、ポリエーテルエーテルケトン樹脂をマトリックス樹脂とし、固体潤滑剤としてポリテトラフルオロエチレン樹脂を含む樹脂組成物の塗膜であるので、低摩擦性と耐摩耗性に優れる。また、上記樹脂塗膜の膜厚が２０μｍ〜５０μｍであるので、長期にわたり摩耗を抑制できる。 In particular, since the resin coating film is a coating film of a resin composition containing polyetheretherketone resin as a matrix resin and polytetrafluoroethylene resin as a solid lubricant, it is excellent in low friction and abrasion resistance. Further, since the film thickness of the resin coating film is 20 μm to 50 μm, wear can be suppressed for a long period of time.

また、上記保持器は、一対の環状体がポケット間に位置する連結部で結合された波形保持器であり、これら環状体の全面に樹脂塗膜を有するので、従来と同型の保持器基材（鉄板）を使用しつつ、防錆メッキと三価クロメートの場合の被膜よりも厚膜の樹脂塗膜を形成しながら、玉と保持器との関係（玉と保持器ポケット面との距離など）を従来と同様にできる。 Further, the cage is a corrugated cage in which a pair of annular bodies are connected by a connecting portion located between pockets, and since the entire surface of these annular bodies has a resin coating film, the cage base material of the same type as the conventional one. While using (iron plate), while forming a resin coating film that is thicker than the coating film in the case of rust-preventive plating and trivalent chromate, the relationship between the ball and the cage (distance between the ball and the cage pocket surface, etc.) ) Can be performed in the same way as before.

本発明の転がり軸受は、内輪および外輪と、この内輪と外輪との間に介在する転動体である玉と、この玉を保持する保持器とを備えてなり、この保持器が本発明の転がり軸受用保持器であるので、グリースの潤滑寿命低下などを抑制した長寿命な転がり軸受となる。このため、鉄道車両の主電動機の主軸を回転自在に支持する軸受として好適に利用できる。 The rolling bearing of the present invention comprises an inner ring and an outer ring, a ball which is a rolling element interposed between the inner ring and the outer ring, and a cage for holding the ball, and this cage is the rolling of the present invention. Since it is a cage for bearings, it is a rolling bearing with a long life that suppresses a decrease in the lubrication life of grease. Therefore, it can be suitably used as a bearing that rotatably supports the spindle of the traction motor of a railway vehicle.

本発明の転がり軸受を示す平面図である。It is a top view which shows the rolling bearing of this invention. 図１の転がり軸受の一部断面図である。It is a partial cross-sectional view of the rolling bearing of FIG. 波形保持器を構成する一対の環状体の一方の平面図である。It is a top view of one of the pair of annular bodies constituting the waveform cage. 鉄道車両の主電動機の構成を示す図である。It is a figure which shows the structure of the traction motor of a railroad vehicle. 図４における転がり軸受周囲（左側）の構成を示す拡大図である。It is an enlarged view which shows the structure around the rolling bearing (left side) in FIG.

従来、鉄道車両の主電動機用の軸受などには、深溝玉軸受などの鉄板波形保持器を用いた軸受が使用されていた。上述のように、この鉄板波形保持器の表面は、例えば、冷延鋼板の表面に防錆用の電気亜鉛メッキ、電気錫−亜鉛合金メッキ、電気亜鉛−鉄合金メッキ、電気亜鉛−ニッケル合金メッキなどの防錆下地処理を行なった後、その上に所定の三価クロメート処理を行ない、所定の被膜（厚さ１０μｍ程度）を形成していた。しかし、この保持器ではポケットの案内面において、使用条件の過酷化に伴う潤滑状態の悪化により当りが出て摩耗の発生が起こり得る。本発明の保持器では、このような亜鉛メッキ等と三価クロメートの被膜にかえて、所定の樹脂塗膜を表面に形成したものである。 Conventionally, bearings using iron plate waveform cages such as deep groove ball bearings have been used for bearings for traction motors of railway vehicles. As described above, the surface of this iron plate corrugated cage is, for example, the surface of a cold-rolled steel plate coated with electrogalvanizing for rust prevention, electrogalvanizing-zinc alloy plating, electrogalvanizing-iron alloy plating, electrozinc-nickel alloy plating. After performing the rust preventive base treatment such as, a predetermined trivalent chromate treatment was performed on the rust preventive base treatment to form a predetermined film (thickness of about 10 μm). However, in this cage, the guide surface of the pocket may be hit due to deterioration of the lubrication state due to severe usage conditions, and wear may occur. In the cage of the present invention, a predetermined resin coating film is formed on the surface instead of the zinc plating or the like and the trivalent chromate coating film.

本発明の転がり軸受用保持器を用いた転がり軸受の一例について図１および図２を参照して説明する。図１はこの転がり軸受の平面図であり、図２はこの転がり軸受の一部断面図である。転がり軸受１は、外周面に内輪転走面を有する内輪２と、内周面に外輪転走面を有する外輪３とが同心に配置され、内輪転走面と外輪転走面との間に複数個の転動体である玉４が配置されている。玉４は、金属製の保持器５により周方向等間隔に保持されている。保持器５は、転動体である玉４を保持するポケット６を周方向等間隔で複数箇所に有する。保持器５は、一対の環状体がポケット６間に位置する連結部で結合された波形保持器である。保持器５の表面に後述の所定の樹脂塗膜７が形成されている。この転がり軸受１では、転動体４の周囲にグリースや潤滑油（図示省略）が封入または供給されて使用される。 An example of a rolling bearing using the roller bearing cage of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a plan view of the rolling bearing, and FIG. 2 is a partial cross-sectional view of the rolling bearing. In the rolling bearing 1, the inner ring 2 having an inner ring rolling surface on the outer peripheral surface and the outer ring 3 having an outer ring rolling surface on the inner peripheral surface are concentrically arranged between the inner ring rolling surface and the outer ring rolling surface. Balls 4, which are a plurality of rolling elements, are arranged. The balls 4 are held at equal intervals in the circumferential direction by a metal cage 5. The cage 5 has pockets 6 for holding the ball 4 which is a rolling element at a plurality of positions at equal intervals in the circumferential direction. The cage 5 is a corrugated cage in which a pair of annular bodies are connected by a connecting portion located between the pockets 6. A predetermined resin coating film 7 described later is formed on the surface of the cage 5. In this rolling bearing 1, grease or lubricating oil (not shown) is sealed or supplied around the rolling element 4 for use.

保持器の構成を図３に基づいて説明する。図３（ａ）は図１、２における保持器の一方の環状体であり、保持器全面に樹脂塗膜を形成したものを、図３（ｂ）は保持器の一部に樹脂塗膜を形成したものを、それぞれ示す。図１、図２、図３（ａ）に示すように、保持器５を構成する環状体５’は、玉４に沿って湾曲した複数の湾曲部５ａと、これらの湾曲部５ａを連結する連結部５ｂが、周方向に交互に形成されている。連結部５ｂは、略平板状であり、リベット用の穴５ｃが形成されている。一対の該環状体は、湾曲部５ａ同士と、連結部５ｂ同士が対向した状態で、連結部５ｂの穴５ｃを介してリベット８（図１参照）で固定されて一体化されている。対向する湾曲部５ａ同士により、ポケット６が形成される。このポケット６の内面（転動体案内面）は、玉４の外径形状に沿った形状とされている。すなわち、ポケット６の内面は、玉４の半径とほぼ同じ曲率半径の凹球面状とされている。 The configuration of the cage will be described with reference to FIG. FIG. 3A shows one annular body of the cage in FIGS. 1 and 2, and a resin coating film is formed on the entire surface of the cage, and FIG. 3B shows a resin coating film formed on a part of the cage. The formed ones are shown respectively. As shown in FIGS. 1, 2, and 3 (a), the annular body 5'constituting the cage 5 connects a plurality of curved portions 5a curved along the ball 4 and these curved portions 5a. The connecting portions 5b are formed alternately in the circumferential direction. The connecting portion 5b has a substantially flat plate shape, and a hole 5c for rivets is formed. The pair of annular bodies are fixed and integrated with rivets 8 (see FIG. 1) via holes 5c of the connecting portions 5b in a state where the curved portions 5a and the connecting portions 5b face each other. The pocket 6 is formed by the curved portions 5a facing each other. The inner surface (rolling element guide surface) of the pocket 6 has a shape that follows the outer diameter shape of the ball 4. That is, the inner surface of the pocket 6 has a concave spherical surface having a radius of curvature substantially the same as the radius of the ball 4.

各環状体５’は、金属板をプレス成形して製造されている。金属材料としては、保持器材として一般的に用いられる任意の材料を使用でき、例えば、冷間圧延鋼板、炭素鋼などが挙げられる。 Each annular body 5'is manufactured by press-molding a metal plate. As the metal material, any material generally used as a cage material can be used, and examples thereof include cold-rolled steel sheets and carbon steel.

図３（ａ）および図３（ｂ）に示すように、環状体５’において、少なくとも湾曲部５ａの内面に樹脂塗膜７を形成することで、保持器において転動体案内面となるポケット６の内面に樹脂塗膜７が形成される。この樹脂塗膜７により、玉の進み遅れにより、該玉と接触する周方向案内面において摩耗を抑制でき、金属摩耗粉の発生を防止できる。このため、金属摩耗粉がグリースに混入して潤滑寿命が低下する等の問題を解消できる。 As shown in FIGS. 3A and 3B, in the annular body 5', by forming the resin coating film 7 on at least the inner surface of the curved portion 5a, the pocket 6 serving as the rolling element guide surface in the cage A resin coating film 7 is formed on the inner surface of the surface. With this resin coating film 7, it is possible to suppress wear on the circumferential guide surface in contact with the ball due to the advance delay of the ball, and it is possible to prevent the generation of metal wear powder. Therefore, it is possible to solve the problem that the metal wear powder is mixed with the grease and the lubrication life is shortened.

本発明の保持器に形成する樹脂塗膜は、マトリックス樹脂として芳香族ポリエーテルケトン（ＰＥＫ）系樹脂を用い、これに固体潤滑剤を含む樹脂組成物の塗膜である。マトリックス樹脂として芳香族ＰＥＫ系樹脂を採用することで、耐熱性、耐油・耐薬品性、耐クリープ性、摩擦摩耗特性に優れた樹脂塗膜となる。また、芳香族ＰＥＫ系樹脂は、靭性、高温時の機械物性が高く、耐疲労特性、耐衝撃性にも優れているため、転動体である玉の進み遅れにより、該玉と樹脂塗膜が接触し、摩擦力や衝撃、振動が加わる際にも、樹脂塗膜の摩耗や保持器基材からの剥離が起こりにくい。 The resin coating film formed on the cage of the present invention is a coating film of a resin composition in which an aromatic polyetherketone (PEK) -based resin is used as the matrix resin and a solid lubricant is contained therein. By adopting an aromatic PEK resin as the matrix resin, a resin coating film having excellent heat resistance, oil / chemical resistance, creep resistance, and frictional wear characteristics can be obtained. In addition, the aromatic PEK-based resin has high toughness and mechanical properties at high temperatures, and is also excellent in fatigue resistance and impact resistance. Therefore, due to the advance delay of the ball, which is a rolling element, the ball and the resin coating film are separated from each other. Even when contact is applied and frictional force, impact, or vibration is applied, the resin coating is less likely to wear or peel off from the cage base material.

本発明で使用できる芳香族ＰＥＫ系樹脂としては、ポリエーテルエーテルケトン（ＰＥＥＫ）樹脂、ポリエーテルケトン（ＰＥＫ）樹脂、ポリエーテルケトンエーテルケトンケトン（ＰＥＫＥＫＫ）樹脂などがある。これらの中でも、特に物性や入手性に優れることからＰＥＥＫ樹脂を採用することが好ましい。 Examples of the aromatic PEK-based resin that can be used in the present invention include polyetheretherketone (PEEK) resin, polyetherketone (PEK) resin, and polyetherketone etherketoneketone (PEKEKK) resin. Among these, it is preferable to use PEEK resin because it is particularly excellent in physical properties and availability.

ＰＥＥＫ樹脂は、ベンゼン環がパラの位置で、カルボニル基とエーテル結合によって連結された下記式（１）に示すポリマー構造を持つ結晶性の熱可塑性樹脂である。下記式（１）の構造を持つＰＥＥＫ樹脂は、融点が約３４０℃、ガラス転移点が１４３℃であり、優れた耐熱性、耐クリープ性、耐荷重性、耐摩耗性、摺動特性などを有する。 The PEEK resin is a crystalline thermoplastic resin having a polymer structure represented by the following formula (1) in which a benzene ring is connected to a carbonyl group by an ether bond at the para position. PEEK resin having the structure of the following formula (1) has a melting point of about 340 ° C. and a glass transition point of 143 ° C., and has excellent heat resistance, creep resistance, load resistance, wear resistance, sliding characteristics, etc. Have.

Figure 0006864437
Figure 0006864437

本発明に使用できる固体潤滑剤としては、フッ素樹脂や黒鉛が挙げられる。フッ素樹脂としては、低摩擦性を樹脂塗膜に付与でき、該塗膜の使用温度雰囲気に耐える耐熱性を有するものであれば使用できる。フッ素樹脂としては、例えば、ポリテトラフルオロエチレン（ＰＴＦＥ）樹脂、テトラフルオロエチレン−パーフルオロアルキルビニルエーテル（ＰＦＡ）共重合体樹脂、テトラフルオロエチレン−ヘキサフルオロプロピレン（ＦＥＰ）共重合体樹脂、テトラフルオロエチレン−エチレン（ＥＴＦＥ）共重合体樹脂などが挙げられる。これらの中でも、ＰＴＦＥ樹脂の粉末を用いることが好ましい。ＰＴＦＥ樹脂は、約３４０〜３８０℃の溶融粘度が約１０10〜１０11Ｐａ・ｓと高く、融点を越えても流動し難く、フッ素樹脂の中では最も耐熱性に優れ、摩擦摩耗特性にも優れる。 Examples of the solid lubricant that can be used in the present invention include fluororesin and graphite. As the fluororesin, any fluororesin that can impart low friction to the resin coating film and has heat resistance that can withstand the operating temperature atmosphere of the coating film can be used. Examples of the fluororesin include polytetrafluoroethylene (PTFE) resin, tetrafluoroethylene-perfluoroalkyl vinyl ether (PFA) copolymer resin, tetrafluoroethylene-hexafluoropropylene (FEP) copolymer resin, and tetrafluoroethylene. -Ethylene (ETFE) copolymer resin and the like can be mentioned. Among these, it is preferable to use PTFE resin powder. PTFE resin has a high melt viscosity of about 340 to 380 ° C. of about 10 10 to 10 11 Pa · s, does not easily flow even if it exceeds the melting point, has the best heat resistance among fluororesins, and has frictional wear characteristics. Excellent.

ＰＴＦＥ樹脂としては、−（ＣＦ２−ＣＦ２）ｎ−で表される一般のＰＴＦＥ樹脂を用いることができ、また、一般のＰＴＦＥ樹脂にパーフルオロアルキルエーテル基（−ＣｐＦ２ｐ−Ｏ−）（ｐは１−４の整数）あるいはポリフルオロアルキル基（Ｈ（ＣＦ２）ｑ−）（ｑは１−２０の整数）などを導入した変性ＰＴＦＥ樹脂も使用できる。これらのＰＴＦＥ樹脂および変性ＰＴＦＥ樹脂は、一般的なモールディングパウダーを得る懸濁重合法、ファインパウダーを得る乳化重合法のいずれを採用して得られたものでもよい。 The PTFE resin, - (CF 2 -CF 2) n- in can be used ordinary PTFE resin represented, also generally of PTFE resin perfluoroalkyl ether group (-C p F 2p -O- ) (P is an integer of 1-4) or a modified PTFE resin having a polyfluoroalkyl group (H (CF 2 ) q −) (q is an integer of 1-20) or the like can also be used. These PTFE resin and modified PTFE resin may be obtained by adopting either a suspension polymerization method for obtaining a general molding powder or an emulsion polymerization method for obtaining a fine powder.

ＰＴＦＥ樹脂の粉末の平均粒子径（レーザー解析法による測定値）は、特に限定されるものではないが、樹脂塗膜の膜厚や、機械的強度、耐摩耗性を考慮して２０μｍ以下とすることが好ましい。また、ＰＴＦＥ樹脂粉末としては、ＰＴＦＥ樹脂をその融点以上で加熱焼成したものを使用できる。また、加熱焼成した粉末に、さらにγ線または電子線などを照射した粉末も使用できる。これらのＰＴＦＥ樹脂粉末は、加熱焼成等されていないＰＴＦＥ樹脂（モールディングパウダー、ファインパウダー）と比較して、樹脂塗膜を形成する塗料中での均一分散性に優れ、形成された樹脂塗膜の耐摩耗特性が優れる。 The average particle size of the PTFE resin powder (measured by the laser analysis method) is not particularly limited, but is set to 20 μm or less in consideration of the film thickness of the resin coating film, mechanical strength, and abrasion resistance. Is preferable. Further, as the PTFE resin powder, a PTFE resin obtained by heating and firing at a melting point or higher thereof can be used. Further, a powder obtained by irradiating the heat-baked powder with γ-rays or electron beams can also be used. These PTFE resin powders are superior in uniform dispersibility in the paint forming the resin coating film as compared with the PTFE resin (molding powder, fine powder) that has not been heat-baked or the like, and the formed resin coating film has excellent uniform dispersibility. Excellent wear resistance.

黒鉛は、固体潤滑剤として優れた特性を有する。黒鉛の形状としては、りん片状、粒状、球状などがあるが、いずれも使用できる。また、天然黒鉛と人造黒鉛に大別されるが、本発明では固定炭素９８．５％以上の人造黒鉛が好ましい。このような黒鉛は、グリース中の基油とのなじみ性が高く、表面に油が付着していなくても黒鉛中に微量に含浸された油によって潤滑性が維持される。黒鉛の平均粒子径（レーザー解析法による測定値）は、特に限定されるものではないが、上記ＰＴＦＥ樹脂の場合と同様の理由で、２０μｍ以下とすることが好ましい。 Graphite has excellent properties as a solid lubricant. The shape of graphite includes flaky, granular, spherical, etc., but any of them can be used. Further, it is roughly classified into natural graphite and artificial graphite, but in the present invention, artificial graphite having 98.5% or more fixed carbon is preferable. Such graphite has high compatibility with the base oil in the grease, and even if the oil does not adhere to the surface, the lubricity is maintained by the oil impregnated in the graphite in a small amount. The average particle size of graphite (measured value by the laser analysis method) is not particularly limited, but is preferably 20 μm or less for the same reason as in the case of the above-mentioned PTFE resin.

本発明の保持器に形成する樹脂塗膜を形成する樹脂組成物において、ＰＴＦＥ樹脂などの固体潤滑剤は、マトリックス樹脂である芳香族ＰＥＫ系樹脂１００重量部に対して、例えば３〜１５０重量部、好ましくは１０〜１００重量部配合する。また、この樹脂組成物には、本発明の必要特性を低下させない範囲であれば他の補強材や添加剤を含んでもよい。 In the resin composition for forming the resin coating film formed on the cage of the present invention, the solid lubricant such as PTFE resin is, for example, 3 to 150 parts by weight with respect to 100 parts by weight of the aromatic PEK resin which is a matrix resin. , Preferably 10 to 100 parts by weight. Further, the resin composition may contain other reinforcing materials and additives as long as the required properties of the present invention are not deteriorated.

樹脂塗膜は、上記樹脂組成物からなる樹脂塗料を用いて、スプレーコーティング、ディスペンサーコーティングなどの公知の塗布方法で形成できる。この樹脂塗料は固形分である芳香族ＰＥＫ系樹脂、ＰＴＦＥ樹脂などを、溶剤類に分散または溶解させることにより得られる。溶剤類としては、アセトン、メチルエチルケトンなどのケトン類、酢酸メチル、酢酸エチルなどのエステル類、トルエン、キシレンなどの芳香族炭化水素類、メチルクロロホルム、トリクロロエチレン、トリクロロトリフルオロエタンなどの有機ハロゲン化化合物類、Ｎ−メチル−２−ピロリドン（ＮＭＰ）、メチルイソピロリドン（ＭＩＰ）、ジメチルホルムアミド（ＤＭＦ）、ジメチルアセトアミド（ＤＭＡＣ）などの非プロトン系極性溶剤類などを使用できる。コーティング方法にあわせ、溶剤の種類、液粘度を調整すればよい。 The resin coating film can be formed by a known coating method such as spray coating or dispenser coating using a resin paint composed of the above resin composition. This resin coating material is obtained by dispersing or dissolving an aromatic PEK-based resin, PTFE resin, or the like which is a solid content in a solvent. Solvents include ketones such as acetone and methyl ethyl ketone, esters such as methyl acetate and ethyl acetate, aromatic hydrocarbons such as toluene and xylene, and organic halogenated compounds such as methyl chloroform, trichloroethylene and trichlorotrifluoroethane. , N-Methyl-2-pyrrolidone (NMP), methylisopyrrolidone (MIP), dimethylformamide (DMF), dimethylacetamide (DMAC) and other aproton polar solvents can be used. The type of solvent and the viscosity of the liquid may be adjusted according to the coating method.

樹脂塗料を保持器基材に塗布した後、焼成することで硬化・密着された樹脂塗膜が得られる。また、樹脂塗膜の形成前において、保持器基材の樹脂塗膜形成面は、塗膜との密着性を向上させるために、ショットブラストなどにより凹凸形状に荒らす、または、化学表面処理を施して微細凹凸形状を形成することが好ましい。 After applying the resin paint to the cage base material, it is fired to obtain a cured and adhered resin coating film. Further, before the formation of the resin coating film, the surface of the cage base material on which the resin coating film is formed is roughened into an uneven shape by shot blasting or the like, or is subjected to a chemical surface treatment in order to improve the adhesion with the coating film. It is preferable to form a fine uneven shape.

樹脂塗膜の膜厚は、好ましくは２０μｍ〜５０μｍであり、より好ましくは２５μｍ〜３５μｍである。樹脂塗膜の膜厚範囲については、焼成後の膜厚を所定範囲にする、もしくは、焼成後の膜厚はより厚くなるよう形成し、研磨等の機械加工で所定範囲にしてもよい。 The film thickness of the resin coating film is preferably 20 μm to 50 μm, and more preferably 25 μm to 35 μm. Regarding the film thickness range of the resin coating film, the film thickness after firing may be set to a predetermined range, or the film thickness after firing may be formed to be thicker and set to a predetermined range by machining such as polishing.

図３（ｂ）では、環状体５’の湾曲部５ａにのみ樹脂塗膜７が形成され、連結部５ｂには形成されていない。この選択形成は、上述のスプレーコーティングなどの際に、不要部分である連結部や湾曲部の裏面などをマスキングすることで行なう。従来の防錆メッキと三価クロメートによる被膜の場合は、膜厚が１０μｍ程度であり、上述の好適範囲に示すように樹脂塗膜７はこれと比較すると厚膜となる。このため、図３（ｂ）の場合、保持器基材が従来と同寸法であると、ポケット６と玉との余剰隙間が僅かに小さくなる。 In FIG. 3B, the resin coating film 7 is formed only on the curved portion 5a of the annular body 5', and is not formed on the connecting portion 5b. This selective formation is performed by masking the back surface of the connecting portion and the curved portion, which are unnecessary portions, at the time of the above-mentioned spray coating or the like. In the case of the conventional rust-preventive plating and trivalent chromate coating film, the film thickness is about 10 μm, and as shown in the above-mentioned preferable range, the resin coating film 7 is thicker than this. Therefore, in the case of FIG. 3B, if the cage base material has the same dimensions as the conventional one, the excess gap between the pocket 6 and the ball becomes slightly smaller.

また、図３（ａ）では、環状体５’の全面に樹脂塗膜７が形成され、連結部５ｂ表面にも形成されている。このため、リベットにより２つの環状体を一体化した際に、連結部間に樹脂塗膜が挟まれ僅かに隙間ができる。この結果、従来の被膜よりも厚膜の樹脂塗膜を形成しながら、玉と保持器との関係（ポケットと玉との余剰隙間など）を従来とほぼ同様にできる。 Further, in FIG. 3A, the resin coating film 7 is formed on the entire surface of the annular body 5', and is also formed on the surface of the connecting portion 5b. Therefore, when the two annular bodies are integrated by the rivet, the resin coating film is sandwiched between the connecting portions and a slight gap is formed. As a result, the relationship between the ball and the cage (excess gap between the pocket and the ball, etc.) can be made almost the same as the conventional one while forming a resin coating film thicker than the conventional film.

本発明の転がり軸受を適用する鉄道車両の主電動機について図４に基づいて説明する。図４は、主電動機１０の構成を示す図である。図４に示すように、主電動機１０は、コイル１２ａを有する固定子１２と、固定子１２に対向するように配置された回転子１３と、固定子１２および回転子１３を取り囲むように配置されたフレーム１１とを主に備えている。回転子１３の中心部（回転軸）を含む部位には、主軸１６が貫通するように固定されている。主電動機１０において、まず３相交流電流が固定子１２のコイル１２ａに供給される。このとき、回転子１３の周りに回転磁界が形成され、この回転磁界により回転子１３に誘導電流が発生する。このように、回転子１３の周りに回転磁界が形成され、かつ回転子１３に誘導電流が発生することで、回転子１３を回転軸周りに回転させるように働く電磁力が発生し、回転子１３が回転する。この回転子１３の回転は、主軸１６を介して外部に取り出される。 The traction motor of a railway vehicle to which the rolling bearing of the present invention is applied will be described with reference to FIG. FIG. 4 is a diagram showing the configuration of the traction motor 10. As shown in FIG. 4, the traction motor 10 is arranged so as to surround the stator 12 having the coil 12a, the rotor 13 arranged so as to face the stator 12, and the stator 12 and the rotor 13. The frame 11 is mainly provided. The main shaft 16 is fixed so as to penetrate the portion including the central portion (rotating shaft) of the rotor 13. In the traction motor 10, first, a three-phase alternating current is supplied to the coil 12a of the stator 12. At this time, a rotating magnetic field is formed around the rotor 13, and an induced current is generated in the rotor 13 by this rotating magnetic field. In this way, a rotating magnetic field is formed around the rotor 13 and an induced current is generated in the rotor 13, so that an electromagnetic force that acts to rotate the rotor 13 around the rotation axis is generated, and the rotor 13 rotates. The rotation of the rotor 13 is taken out to the outside via the spindle 16.

主電動機１０は、主軸１６をその外周面１６ａに対向して配置される部材に対して軸周りに回転自在に支持する第１軸受装置１４および第２軸受装置１５をさらに備えている。第１軸受装置１４は、主軸１６の固定側を支持する第１の転がり軸受１７を備えており、第２軸受装置１５は、主軸１６の自由側を支持する第２の転がり軸受１８を備えている。 The traction motor 10 further includes a first bearing device 14 and a second bearing device 15 that rotatably support the spindle 16 with respect to a member arranged so as to face the outer peripheral surface 16a thereof. The first bearing device 14 includes a first rolling bearing 17 that supports the fixed side of the spindle 16, and the second bearing device 15 includes a second rolling bearing 18 that supports the free side of the spindle 16. There is.

図５は、第１軸受装置１４の構成を示す拡大図である。図５に示すように、第１軸受装置１４は、第１の転がり玉軸受１７と、ハウジング１９と、ストッパ２０と、端蓋２１と、油切り２２とを備えている。第１の転がり軸受１７が、本発明の保持器を備えた転がり軸受である。第１の転がり軸受１７は、外輪と内輪との間の軸受空間がシール部材により閉じられない開放形軸受とされ、潤滑剤（潤滑油やグリース）がこの軸受空間に供給されることで、該潤滑剤が軌道面などに介在して潤滑がなされる。また、シール部材を設けてグリースを封入する態様としてもよい。なお、潤滑油やグリースとしては、通常、主電動機用軸受に用いられるものであれば特に制限なく用いることができる。 FIG. 5 is an enlarged view showing the configuration of the first bearing device 14. As shown in FIG. 5, the first bearing device 14 includes a first rolling ball bearing 17, a housing 19, a stopper 20, an end lid 21, and an oil drain 22. The first rolling bearing 17 is a rolling bearing provided with the cage of the present invention. The first rolling bearing 17 is an open bearing in which the bearing space between the outer ring and the inner ring is not closed by the sealing member, and the lubricant (lubricating oil or grease) is supplied to the bearing space. Lubrication is performed by interposing a lubricant on the raceway surface or the like. Further, a sealing member may be provided to seal the grease. The lubricating oil and grease can be used without particular limitation as long as they are usually used for bearings for traction motors.

支持構造に本発明の転がり軸受を採用することで、上述のとおり、グリースの潤滑寿命低下などを抑制でき、長寿命となる。また、図４に示すように自由側の第２の転がり軸受１８も玉軸受とする構成の場合は、この第２の転がり軸受１８にも本発明の転がり軸受を採用できる。 By adopting the rolling bearing of the present invention for the support structure, as described above, it is possible to suppress a decrease in the lubrication life of the grease, and the life is extended. Further, when the second rolling bearing 18 on the free side is also a ball bearing as shown in FIG. 4, the rolling bearing 18 of the present invention can also be adopted for the second rolling bearing 18.

本発明の転がり軸受用保持器は、金属製保持器を用い、グリースによる潤滑機能が低下した場合でも、転動体である玉を保持するポケットの案内面での摩耗を抑制できるので、種々の転がり軸受（玉軸受）に適用できる。特に、鉄道車両の主電動機用主軸の支持構造に用いる転がり軸受に好適である。 The cage for rolling bearings of the present invention uses a metal cage and can suppress wear on the guide surface of the pocket that holds the ball, which is a rolling element, even when the lubrication function is deteriorated by grease, so that various types of rolling can be performed. Applicable to bearings (ball bearings). In particular, it is suitable for rolling bearings used in the support structure of spindles for traction motors of railway vehicles.

１ 転がり軸受（玉軸受）
２ 内輪
３ 外輪
４ 玉
５ 保持器
６ ポケット
７ 樹脂塗膜
８ リベット
１０ 主電動機
１１ フレーム
１２ 固定子
１３ 回転子
１４ 第１軸受装置
１５ 第２軸受装置
１６ 主軸
１７ 第１の転がり軸受
１８ 第２の転がり軸受
１９ ハウジング
２０ ストッパ
２１ 端蓋
２２ 油切り 1 Rolling bearing (ball bearing)
2 Inner ring 3 Outer ring 4 Ball 5 Cage 6 Pocket 7 Resin coating 8 Rivet 10 Main motor 11 Frame 12 Fixture 13 Rotor 14 1st bearing device 15 2nd bearing device 16 Main shaft 17 1st rolling bearing 18 2nd Rolling bearing 19 Housing 20 Stopper 21 End lid 22 Oil drain

Claims (1)

内輪および外輪と、この内輪と外輪との間に介在する転動体である玉と、この玉を保持する保持器とを備えてなる転がり軸受であって、
前記転がり軸受は、鉄道車両の主電動機の主軸を回転自在に支持する軸受であり、グリース潤滑で使用され、
前記保持器は、前記転動体である玉を保持するポケットを円周方向の複数箇所に有し、一対の環状体が前記ポケット間に位置する連結部で結合された金属製の波形保持器であり、少なくとも転動体案内面となる前記ポケットの内面（ただし、前記連結部を除く）に、単層の樹脂塗膜を有し、
前記樹脂塗膜は、ポリエーテルエーテルケトン樹脂をマトリックス樹脂とし、固体潤滑剤としてポリテトラフルオロエチレン樹脂を含む樹脂組成物の塗膜であり、
前記樹脂塗膜の膜厚が２０μｍ〜５０μｍであることを特徴とする転がり軸受。 A rolling bearing comprising an inner ring and an outer ring, a ball which is a rolling element interposed between the inner ring and the outer ring, and a cage for holding the ball.
The rolling bearing is a bearing that rotatably supports the spindle of a traction motor of a railroad vehicle, and is used for grease lubrication.
The cage is a metal corrugated cage having pockets for holding the ball, which is the rolling element, at a plurality of positions in the circumferential direction, and a pair of annular bodies connected by a connecting portion located between the pockets. Yes, at least the inner surface of the pocket (excluding the connecting portion) that serves as the rolling element guide surface has a single-layer resin coating film.
The resin coating film, a polyether ether ketone resin as a matrix resin, Ri coating der resin composition comprising a polytetrafluoroethylene resin as a solid lubricant,
A rolling bearing characterized in that the film thickness of the resin coating film is 20 μm to 50 μm.
JP2016061482A 2016-03-25 2016-03-25 Rolling bearing Active JP6864437B2 (en)

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US16/088,299 US20190093706A1 (en) 2016-03-25 2017-03-24 Rolling bearing retainer and rolling bearing
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